Automatic eraser



Feb. 28, 1928.

H. G. COY

AUTOMATIC ERASER Filed Jan. 18. 1927 INVENTR. HmrG. Cqr

i ATTORNEY.

4 4 3 w u7/ fl//M/ i Patented Feb. 28, 1928.`

` E TAT Es IOMER G. cot on NEW YORK; N.` Y.

i Amom'rc nmen.

a Application me& January s; 1921; Serial no, 161399.

'This invention relates to eresers, more particularly to an e'raser' ofthe power operated type,` and has for'its object to pro-` Vide,` inmmanner as herenafter set forth, a device of the t pe referred toincluding an erasing or ibra ing element capable'of having a vibratoryaction imparted to` a` portion thei-cof to provide an erasive action toquickly and eflicientlyremove ink or pencil lines 01' ink or pencilmarkings or other mrkings to be eresed. i

Further objects of the invention are to provide, 'in 21; mnner asherein'after ;set forth, an eraserwhich is simple `in"its-construction:and arrangement, "strong, compaet, durable, thoroughly eflicieit in itsuse;

Conveniently thrown into "active position, readily pensive tomanitfaeturei i\ With thefregoingefd otherobjects in View the inventionconsistsofthe novel; construction, coiibnation `and arrngeinent of partses herei'nefter more fspecificlly de`- scribed and illustrated in theaccompanying drawings,` W'herein is shown an "emb diment of theinvention, but it is to be un" erstood that changes, varitions and"modifieations can be resorted to whih fall "within` the scope oftheolains'` hereunto appended. "In the drewings"w hereinflike" referencebharacter's "denote` corresponding parts throughoutthejseveralviewsz;ing accordance with this` intention, in maetive position and nountedupon a`snp`portl" `'l`ig`uref2 is affragnentary View in `lon"- gtlidinalsection illustrating the erasingor abrading element carrier.` 4

Figure 3 is a section on line 3-3 Figure 2. Fgure t is a section online4-4 Figure 2. An eraser, in &cool-dance with this inven- V tionincludes a` vibi'atoryerasing or brading element, a 'nanually ortablecarrier or holder therefor, and an eleetrically operated combined fluidi pressure snpply 'and suction mechanism to provide "for the Vib'etionbf 'the erasing or abradin element to set up n erasing function`for t e letter. A The carrier or holder for theterasing or abradngelement consists of a bodyportion 1, of appropriate length so thtftcanbe `grasped by the hand and held or shifted to the desired positionandpreferahly the body assenbled and" conparatively inexi Figur-e 1' isa front eleYa ionfofhniei'ser portion 1 is of eirclar cross section.`The body portion 1"at"fits lower orginnaend is` of taperedcontourasindicated at The body portion 1 is formed with lengthwiseextending eentrally disposed bore 3 which eorrespondsin eonto'ur to thesha e of the eresin or `abrding"element 4, which is noL j istabl ymountcd in "position and `e'na`-` nently set to project af sib'stgntialdistance from the lowerend of the body portion 1. The abredng element iseonstructed of any suitable "mterialfsuchhas rubber `pos:` sessing aeharacteristic to set" up n ibrasive or erasiveaetion when the"deviceisused The bore' 3 `extends" from one `end to the other endofjthe bodyfportion 1 and has its jnneor loWerporti0n "enlzrg edges et5.

The jenlajged innerterminal portion 5 of the bore `3 `projects hiterallyin one direction, withrespect to'thereniai'ing portion of the bore 3;and is disposed diametiolly of the carrier or holdr. The portion"5 ofthe bore 3 provide s a eleerance to permit of theiinner or lowerterminal portion 6; of the element 4, to't hrate." The npper orouter"`en d` of "said bodyportionl, is provided` with `a nipple 7 whichforms acontinuation ofe channel 8 extendinglengthwise ofthebodyporlLlQIE I i i" i The channel 8^is a combined fl idpres suresupply andsection passage endet its inner end ternintes in theoterendof a i i i i.i i e 8 port 9"disposed danetreally ofrthe body I `porti`m1.` The innerend. of the port 9`is portion 1;

i he element& i ad istby &wanted in 9 the body portonl 'to enable ittobe adjusted to extend the*desired` distance fronithe "inner or lower.endet thegbody portion 1 :js

theinner or lowerendcthereof wears away.

"l `he element`4 is Secured in adjusted positions by ediz netrieallydisposed set screw 10` having threaded engagement with the body portion1,` and with its inner endfebut- .ting againstielementjto clamp it i`n`a d "justed position against the Wall ofthe bore 3. Attached to thebody` portionfl:` is &

bail 11 'tor hanging the carrier or holder up and further for normallymaintaining a spring controlled circuit Closer, to be pres entlyreferred to, in inactive position.

,The electrically operated mechanism to provide a vibratory action tothe inner or lower projecting end of the element e includes a'fieXible,combined fluid pressure supply and suction pipe 12 which is 'connectedto the nipple 7. The said mechanism further includes a pump 13 mountedwithin a casing 14 and operated ;from an electric motor 15 which is alsoarranged in the casing 14. The pump 13 includes a cylin-. der 16 havingan air supply port 17 intermediate its ends and a combined air dischargeand suction port 18 at its lower end. The cylinder 16 forms a pistonchamber 19 in which operates a piston 20 to provide for alternate fluid.pressure supply and suction steps with respect to the inner or lowerterminal portion 5, of the element 1 thereby causing said terminalportion -to vibrate, on the operation of 'the pump, to set up theerasing or abrading function for theelement ,4. The pipe 12 is,connected to the casing 14 and opens into the port 18.

The position of the port 17,' in the cylinder 20, is such that the port17 will be cleared by the piston at the 'limitet the upstroke ot thepis'ton, the latter then descends past the port 17 and forces the airbeneath it through' the port 18, pipe 12, channel 8 and port 9 againstthe inner ;or lower terminal portion 5, of 'the element 4, causing it tomove away 'fromtheinner end 'of port 9. The pistonthen rises and createsa suc ton action back through port 9, channel 8, pipe 1-2 and port 18.This back suction, to'- gether with the resiliency of element 1, causesthe inner or lower terminal portion 5 oi' the latter, to move back 'toits original position closing the inner end oi port 9. The pistoncontinues to rise until it clears port 17, which again admits air to'the piston chamber beneath the piston and the descending operation ofthe 'pisten is repeated. In Figure 1, the piston is shown in full lines,just before it reaches'the limit of its upstrokeand in dotted lines justbefore it reaches the, limit of its downstroke.

The circuit connectionsfor the motor 15, are indicated at 21 and whichincludes a contact 22 and 'a spring controlled cireuit closer 23,normally maintained clear of the contact 22, by the hanging otthecarrier or holder 1 on the closer 23; When 'the carrier or holder isremoved from the circuit closer so that the carrier or holder can beshifted to any pointdesired. On the operation of the pump it willprovide for a Vibratory movement at the inner or lower terminal portion6 of the element 4, so the said element 4: will perform its erasing orabrading action.

It is thought'the many advantages of an can be readily understood, andalthough the preferred embodiment of the invention is as illustrated anddescribed, yet it is to he understood that changes in the details ofconstruction can be had which will tall within the scope of theinvention as claimed.

What I claim s:- 1. An eraser comprising an erasing'ele ment carrierincluding means toprovide for the alternate application of fluidpressure and suction directly 'upon-a terminal portion of said elementto vibrate such portion, and a pumping element having an air intake andfurther having axcombined air discharge and suction port communicatingwith said means;

'eraser, in accordance with this invention,

2. An eraser comprising a manually portable erasing element carrier;including means to provide for the alternate applcat ion of fluid,pressure and suction directly upon an' end terminal portion, of saidelement to vibrate such portion, a pumping mechanism a having an airintake and afcombined air -discharge and suction port communicating withsaid means, a'nd an electricmotor .normally in an open circut, saidmotor operatvely connected with said pumping mechanism and Operating thesame When the motor circuit -is closed. I

3. An .eraser comprising an adjusta'blje erasing element, a ortable carrier therefor, said carrier including means top'rovde for the'alternate application of fluid ,piressure and suction directly uponanend terminal portion of said element to vibrate such por tion, and apumping element havingan air intake and a combined air dischargeandsuction port communicating with said means, said carrier furtherincluding means :tor maintaining the erasing element in adjustedpositions.

1. An eraser, comprising in combinaton a carrier provided with acombined fluid pressure supply 'and suction channel and a borecommnnicating intermediate its ends 'with said channel, said boreopening at the ends of the carrier, an erasing element mountedinsaid-bore, extending through and projecting from the carrier andnormally closing the bore 'to said channel,'said bore having anenla'rged 'terminal portion to' permit of the vibration of that partofsaid element projecting from the carrier, and a pumping device havingan air intake and a combined air discharge 'and suction portcommunicating "with said 'channel to cause llU an alte'nate applicationof fluid pressure and suction directly upon that portion of said eraserelement extended from the carrier to Vbrate such portion.

5. An eraser construoted in accordanoe With claim 4, said pumping deviceincluding a flexible pipe nterposed between and opening into said portand channel.

6. An eraseconstructed in accordance Wi th claim 4, an eleotriomotornormally in an 10 open circuit and having an operative drive connectionWithsaid pumping device for operatng the latter when the motor circuitis closed. n i

In testimony whereof, I aflix my signature hereto.

HOMER G. COY.

